Who would be ranked number one if Federer wins the Masters Cup and U.S. Open? Still Federer?
Not necessarily,
Daedalus12, in that Federer, because he's the current title holder in both, is attempting to maintain his lofty perch ... and has a hefty 3,175 points to
defend the rest of the season.
Technically, he could go on an absolute tear by winning a few more Masters shields and other lesser tournaments, while also again winning everything he won over this time last year.
Functionally, though, he can't really boost his numbers much higher than they are—not having lost 850 points at the last three Slams and thus being unable to gain any at either the U.S. Open or Masters Cup, where he
must win simply to maintain his status there.
Nadal, on the other hand, will be 795 points behind Federer as of this Monday (he withdrew from Stuttgart's Mercedes Cup as a precautionary measure to rest his knees, and will lose 250 points as a result) ... but has only a comparatively measly
1,175 points to defend from that point forward until 2009. In other words, if Federer has a
superlative (as opposed to superhuman) summer and fall, then wins the year-end championships, he'll probably've managed to
maintain his points around 6,600 or so. [I consider this unlikely, though, in that Djokovic's best surface is hard courts, and Federer's aura of invincibility has been largely dispelled by Rafa having snapped up his Wimbledon title on a surface where he was supposedly invincible.] If on the other hand Nadal, who usually has an unremarkable summer and has
never been a significant threat at the U.S. Open, does
anything before Flushing Meadows, Federer will be under
enormous pressure come August ... and since Nadal only has a Round of 16 appearance (150 points) to defend there, any kind of decent run—say, to the semis or quarters—gets him points.
The Olympics may play a pivotal role here, too: The ATP is awarding points for the medalists and other high finishers ... and they're being played on hard courts, which gives Federer a chance to grab a few more points to which he'd not have otherwise had access—which is quite unfortunate for Nadal, who
deserves at least a brief run at number one sometime during his career.
My best guess: Federer will lose number one to Nadal sometime before next year's Aussie Open; then Rafa will relinquish it in turn, either to Federer or Djokovic, sometime before the clay court season begins.
If Nadal manages to retool his game for hard courts, too, though ... get ready for a
long Rafa reign. I wouldn't bet against him; after all, people said he was a clay court specialist. They've been forced to eat crow ...
...and grass.
